Unsolved mysteries: Flare gun

Indeed ALL DAMAGE/HEAL item has this +/-10% random damage/heal mechanic,no more wonder why my heal bolt says 440 but sometimes actually heal443,449,500,300,etc...

 

It defence , i pack both my flare gun and carronade on my enforcer and hit a speeder and the intial hit was 30 while my flaregun hit for 35 and then i barrage him with my carronade , but when i hit the defender it hit for 1 and i hit him with the carronade i hit for 20s and my carronade hits for 87 × 6. It look like defence affect the intail damage for all weapons except the naplam

 

Repair bolt has critical repairing like snipers has crit to damage

 

Defense points reduce damage for first tick of flare. After that it gives constant damage. And all burning damges are mostly independent of defense points
But weapons like carronades and missiles deal damage reduction to their every projectile.